[Antennaware] Fwd: HF Colinear Dipoles

Thu Aug 29 06:08:48 EDT 2019

Aage,The link doesn't work.
Joe, K8MP 

-----Original Message-----
From: Aage Halvorsen <la4zh.aage at gmail.com>
To: antennaware <antennaware at contesting.com>; weinfurt <weinfurt at ohio.edu>; n6ry <n6ry at arrl.net>; k8mp <k8mp at aol.com>
Sent: Thu, Aug 29, 2019 05:04 AM
Subject: Re: [Antennaware] Fwd: HF Colinear Dipoles

To all!   STUCK with that single radiation diagram?

Why do you keep putting up 1 and 1 antenna? Why not making the  Extended Double Zepp into another  2 to 128  different antennas at the same time, on that single wire? 

My present antennas is 2x48m long and got 8 pneumatic switches, 4 in each leg.  I can convert the antenna into Extended Double Zepp for 80-40-20 and 10m + a lot of other combinations which alter the beam directions of the antenna, 128 different antennas in one go, or less switches for fewer combinations.

Switching takes 10 to 40 seconds depending on how long the pneumatic lines are ( od3mm id 1,2mm, operating at 1 bar)

Of cause a good antenna tuner is a must,  I use a tuner which stores presets according to what antenna antenna combination and frequency is used, all operated from the PC.

If interesting look at the description here;  https://www.eidolon.no/nedlastninger/nedlastninger/brosjyrer......Eid PneumaBeam....... or write me,  parts available.

73

  Aage (Augie),  LA4ZH

____________________________________________________________________________________________________________________________________________________________________

 On 28.08.2019 23:54, Joe via Antennaware wrote:

 Gents,
I don't like nit-pickers so I hope I don't sound like one.
It's called an Extended Double Zepp. And it's a very versatile antenna.End-fed 1/2 wave = Zepp Center-fed full wave = Double ZeppCenter-fed 1.28 waves = Extended Double Zepp
The advertised gain is 3 db broadside but that's if you can get it a half-wave up. 
I have one at home and it's my primary 80/40/30 horizontal antenna.
I also keep two of them in my FD antenna box and hang them at 90° to each other. I daisy-chain two tuners for quick antenna switching and they work great on all bands, 80 and up.
End of soapbox....
73, Joe, K8MP 

-----Original Message-----
From: Terry Conboy <n6ry at arrl.net>
To: Weinfurtner, Greg <weinfurt at ohio.edu>
Cc: antennaware <antennaware at contesting.com>
Sent: Wed, Aug 28, 2019 04:33 PM
Subject: Re: [Antennaware] Fwd: HF Colinear Dipoles

Hi Greg,
No secrets here!
Have you considered a double extended Zepp?  If you don’t need an out of phase pattern with a broadside null, it’s essentially the same gain as a collinear.
Of course, since the pattern is fairly narrow, you have to have a specific DX target in mind, or the gain goes to waste. 

73, Terry N6RY

 On Aug 28, 2019, at 3:25 AM, Weinfurtner, Greg <weinfurt at ohio.edu> wrote:

I have been eavesdropping on your conversation and would LOVE to be 
included in any email group that you may have going on. I have room for 
an 80 meter 2 ele colinear antenna as you are describing and only need 
20 some countries on 80 to finish 5BDXCC.
I have only bought one commercial antenna in my 46 years as a ham and 
love to experiment with them. Thanks if you include me, for the 
opportunity to listen in and see what comes up!

Greg Weinfurtner NS8O  CWT #1496

On 8/27/2019 9:53 PM, Terry Conboy wrote:

 From: Terry Conboy <n6ry at arrl.net>
Subject: Re: [Antennaware] HF Colinear Dipoles
Date: 2019 August 27, at 6:44:24 PM MST
To: Karin Johnson <karinann at tampabay.rr.com>

The info in Ch 11 of ON4UN's book is almost all about verticals, so won't be of much help.

I've attached four EZNEC models of a two element collinear dipole array for 20m.

Two are just dipoles with separate current sources, one in phase, the other 180 degrees out of phase.  This lets you see what the patterns are without worrying about the feed system.  You can look at the feed Z of each antenna to see what you have to drive.

The other two models have coax feed systems.  When in-phase the two elements each have about a 100 ohm Z, so you can use two half-wavelength (or multiples of 1/2 wl) feedlines and just parallel them at the common point.  They can be any impedance, but the losses and bandwidth will be best with 75 ohm lines.

When out of phase, the elements each have about a 50 ohm Z, so you can use 3/4 wavelength 75 ohm lines to transform the impedance to 100 ohms so the two can be paralleled for a 50 ohm feed at the common point.  (There are many other feed arrangements possible, too.)

If you want to switch the patterns in the real world, you'll have to figure out how to switch the cable lengths and invert the phase.

Let me know if this is what you're looking for.

73, Terry N6RY

On Sun, Aug 25, 2019 at 1:57 PM Karin Johnson <karinann at tampabay.rr.com <mailto:karinann at tampabay.rr.com>> wrote:
Hello Group:

I would like to have a discussion off list about designing a 20 Meter
Colinear dipole array.

Right now I am trying some simulations in EZNEC and am referencing the Low
Band DXing

Book by ON4UN with regard to the Phasing of the two or multiple antennas.

I'm having a bit of difficulty in replicating some the work ON4UN and the
volume authors

Did on the understanding of the Array Chapter number 11.

Anyone who has tried building collinear antennas at HF??  I know that Tom
W8JI has

Done this on a massive scale and that is not what I am trying to accomplish
here.

Just two simple collinear dipoles fed either in phase or out of phase.

The EZNEC simulations seem to blow up when the phasing and matching networks
are

Applied to the two antennas.

Regards,

Karin Anne Johnson  K3UU

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